{"title":"Side + Quad Rear Fins","description":"\u003cp\u003eShop \u003ca href=\"\/collections\/side-quad-rear-fins\"\u003eside fins and quad rear fins\u003c\/a\u003e at Rider Shack. Side bite fins complete a 2+1 setup on midlengths and longboards. Quad rears complete a quad configuration on 5-fin or dedicated quad boards.\u003c\/p\u003e\u003cp\u003eBrowse \u003ca href=\"\/collections\/single-fins\"\u003eSingle Fins\u003c\/a\u003e · \u003ca href=\"\/collections\/quad-fins\"\u003eQuad Fins\u003c\/a\u003e · all \u003ca href=\"\/collections\/surfboard-fins\"\u003esurfboard fins\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"futures-composite-sb1-sidebite-surfboard-fins","title":"Futures Composite SB1 Sidebite Surfboard Fins","description":"\u003carticle\u003e\r\n    \u003cp\u003eThe \u003cstrong\u003eThermotech Surfboard Fins\u003c\/strong\u003e offer a superior alternative to traditional composite fins, providing a consistent flex pattern for enhanced performance in the water. Unlike conventional plastic fins, Thermotech fins deliver exceptional drive and smooth release through turns, making them a top choice for surfers seeking reliability and responsiveness.\u003c\/p\u003e\r\n\r\n    \u003cp\u003eEquipped with the innovative Futures Truss Base, these fins are not only lighter but also stronger, ensuring long-lasting durability and reduced weight for improved board feel. Whether carving powerful turns or riding playful waves, Thermotech fins provide the perfect balance of control and maneuverability.\u003c\/p\u003e\r\n\r\n    \u003ch2\u003eKey Features:\u003c\/h2\u003e\r\n    \u003cul\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eConsistent Flex Pattern:\u003c\/strong\u003e Enhances drive and ensures a smooth release through turns.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eFutures Truss Base:\u003c\/strong\u003e Lightweight and durable construction for improved performance and longevity.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eSuperior to Traditional Plastic Fins:\u003c\/strong\u003e Delivers a high-performance feel without the plastic-like rigidity.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eVersatile Design:\u003c\/strong\u003e Suitable for a variety of surfboards and wave conditions.\u003c\/li\u003e\r\n    \u003c\/ul\u003e\r\n\r\n    \u003cp\u003eUpgrade your surfboard with \u003cstrong\u003eThermotech Surfboard Fins\u003c\/strong\u003e and experience the perfect combination of drive, release, and durability. Designed for surfers who demand performance and reliability, these fins are a must-have for elevating your time in the water. Order now and feel the difference!\u003c\/p\u003e\r\n\u003c\/article\u003e\r\n","brand":"Futures","offers":[{"title":"Default Title","offer_id":52178781602075,"sku":"100607","price":28.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/100607.jpg?v=1779151235"},{"product_id":"fcs-ii-reactor-medium-quad-rear-surfboard-fins","title":"FCS II Reactor Medium Quad Rear Surfboard Fins","description":"\u003carticle\u003e\r\n    \u003cp\u003eThe \u003cstrong\u003eFCS II Reactor Performance Core Medium Quad Rear Surfboard Fins\u003c\/strong\u003e are designed to enhance your quad setup with a snappier, more responsive feel through turns. Featuring a very upright template, these fins provide exceptional agility and control, making them ideal for tight maneuvers and quick directional changes.\u003c\/p\u003e\r\n\r\n    \u003cp\u003eThis set includes two medium-sized fins, perfect for quad rear positions or as sidebites. Made with FCS Performance Core material, these fins deliver a lightweight yet durable construction for consistent high-performance surfing.\u003c\/p\u003e\r\n\r\n    \u003ch2\u003eKey Features:\u003c\/h2\u003e\r\n    \u003cul\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eUpright Template:\u003c\/strong\u003e Optimized for snappy turns and quick directional changes in your quad setup.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eQuad Rear or Sidebite Fins:\u003c\/strong\u003e Includes two medium fins for versatile positioning options.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eFCS Performance Core Material:\u003c\/strong\u003e Lightweight and durable for reliable, high-performance surfing.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eEnhanced Maneuverability:\u003c\/strong\u003e Adds responsiveness to your quad fin configuration for tight maneuvers.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eMedium Size Template:\u003c\/strong\u003e Ideal for surfers seeking balanced control and snappier performance.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eEasy Installation:\u003c\/strong\u003e Compatible with the FCS II fin system for tool-free setup and adjustments.\u003c\/li\u003e\r\n    \u003c\/ul\u003e\r\n\r\n    \u003cp\u003eUpgrade your quad fin setup with the \u003cstrong\u003eFCS II Reactor Performance Core Medium Quad Rear Surfboard Fins\u003c\/strong\u003e. Built for surfers seeking quick turns and enhanced agility, these fins are a must-have for performance-focused surfing. Order your set today and experience the snappy precision of FCS Reactor fins!\u003c\/p\u003e\r\n\u003c\/article\u003e\r\n","brand":"FCS","offers":[{"title":"Default Title","offer_id":52178857984283,"sku":"108301","price":92.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/108301.jpg?v=1779152380"},{"product_id":"fin-solutions-fcs-gx-side-bite-quad-rear-fin-set","title":"Fin Solutions FCS GX Side Bite Quad Rear Fin Set","description":"\u003carticle\u003e\r\n    \u003cp\u003eThe \u003cstrong\u003eFin Solutions FCS 2 Tab GX Side Bite Fins\u003c\/strong\u003e are a versatile set of two fins designed to enhance your surfboard’s performance in \u003cstrong\u003equad rear setups or 2+1 configurations\u003c\/strong\u003e. Whether you’re looking for extra hold, stability, or maneuverability, these side bite fins will help fine-tune your ride.\u003c\/p\u003e\r\n\r\n    \u003ch2\u003eKey Features:\u003c\/h2\u003e\r\n    \u003cul\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eCompatible with FCS 2 Tab System:\u003c\/strong\u003e Easy to install and remove without tools.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eVersatile Performance:\u003c\/strong\u003e Great for use as \u003cstrong\u003equad rear fins or in a 2+1 setup\u003c\/strong\u003e for added control.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eEnhanced Stability \u0026amp; Drive:\u003c\/strong\u003e Provides extra hold and improves turning response.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Made for long-lasting performance in a variety of conditions.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eSet of Two Fins:\u003c\/strong\u003e Perfect for customizing your board’s setup.\u003c\/li\u003e\r\n    \u003c\/ul\u003e\r\n\r\n    \u003cp\u003eUpgrade your surfboard with the \u003cstrong\u003eFin Solutions FCS 2 Tab GX Side Bite Fins\u003c\/strong\u003e and experience a \u003cstrong\u003emore controlled and responsive ride\u003c\/strong\u003e. Whether you're setting up a \u003cstrong\u003equad fin configuration or a 2+1 longboard setup\u003c\/strong\u003e, these fins are the perfect addition to your quiver!\u003c\/p\u003e\r\n\u003c\/article\u003e\r\n","brand":"Rider Shack","offers":[{"title":"Default Title","offer_id":52178886787355,"sku":"109815","price":25.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/109815.jpg?v=1779153235"},{"product_id":"fcs-ii-h4-quad-rear-medium-surfboard-fin-set","title":"FCS II H4 Quad Rear Medium Surfboard Fin Set","description":"\u003carticle\u003e\r\n    \u003ch2\u003eFCS II H4 Quad Rear Medium Surfboard Fin Set\u003c\/h2\u003e\r\n    \u003cp\u003eThe \u003cstrong\u003eFCS II H4 Quad Rear Medium Surfboard Fin Set\u003c\/strong\u003e delivers the same cutting-edge precision and control as the revolutionary H4 thruster set. Designed with \u003cstrong\u003eSwiss engineering\u003c\/strong\u003e and an evolved hydrodynamic template, these quad rears offer an unprecedented level of \u003cstrong\u003espeed, stability, and predictability\u003c\/strong\u003e at high velocity. Perfectly matched to both the \u003cstrong\u003eMedium\u003c\/strong\u003e and \u003cstrong\u003eLarge H4 front fins\u003c\/strong\u003e, this set provides enhanced drive and control while maintaining agility and responsiveness through turns. Let’s go surfing!\u003c\/p\u003e\r\n\r\n    \u003ch3\u003eKey Features\u003c\/h3\u003e\r\n    \u003cul\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eSwiss Engineered Design:\u003c\/strong\u003e Precision construction for maximum control, speed, and hydrodynamic efficiency.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eOptimized for H4 Fronts:\u003c\/strong\u003e Pairs seamlessly with both Medium and Large H4 sets for a balanced, high-performance quad setup.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003ePredictable Performance:\u003c\/strong\u003e Provides stability and control even at high speeds, maintaining hold in critical sections.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eEnhanced Drive \u0026amp; Hold:\u003c\/strong\u003e Quad rear configuration adds grip and flow while keeping turning response sharp and intuitive.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eFCS II Tool-Less System:\u003c\/strong\u003e Quick and easy fin installation with no screws or keys required.\u003c\/li\u003e\r\n    \u003c\/ul\u003e\r\n\r\n    \u003ch3\u003eWhy Choose the FCS II H4 Quad Rears?\u003c\/h3\u003e\r\n    \u003cp\u003eThe \u003cstrong\u003eFCS II H4 Quad Rear Fins\u003c\/strong\u003e expand the performance of your H4 setup by adding rear-end stability, drive, and speed without sacrificing maneuverability. Their unique foil and futuristic template deliver the same precision and control that define the H4 series, making them ideal for surfers chasing performance in faster, more powerful waves.\u003c\/p\u003e\r\n\r\n    \u003cp\u003eUpgrade your setup with the \u003cstrong\u003eFCS II H4 Quad Rear Medium Surfboard Fin Set\u003c\/strong\u003e—the perfect complement to your H4 fronts for speed, flow, and next-level control.\u003c\/p\u003e\r\n\u003c\/article\u003e\r\n","brand":"FCS","offers":[{"title":"Default Title","offer_id":52178896781595,"sku":"110139","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/110139.jpg?v=1779153516"},{"product_id":"futures-pivot-quad-rears-large-honeycomb","title":"Futures Pivot Quad Rears Large Honeycomb","description":"The Pivot fin from Futures is a template that will provide tight turns in the pocket. This fin will excel in punchy beach breaks and critical conditions. Throw these quad rears in for maximum grip and drive! Let's go surfing!","brand":"Futures","offers":[{"title":"Default Title","offer_id":52178986107163,"sku":"113095","price":90.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/113095.jpg?v=1779154696"},{"product_id":"futures-neutral-quad-rears-large-honeycomb","title":"Futures Neutral Quad Rears Large Honeycomb","description":"The Futures Neutral Quad Rears are a template that have a balanced feel for all-around performance surfing. From point break racing to beach break smashing, this fin will do it all! Throw these quad rears in for maximum grip and drive! Let's go surfing!\r\n\r\nTemplate Category | Neutral (balanced, all-around)\r\nConstruction | Honeycomb\r\nSize | Large\r\nSold as a pair (left + right fins) to fit Future's shallow depth fin boxes","brand":"Futures","offers":[{"title":"Default Title","offer_id":52178987221275,"sku":"113101","price":90.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/113101.jpg?v=1779154702"},{"product_id":"futures-neutral-quad-rears-small-honeycomb","title":"Futures Neutral Quad Rears Small Honeycomb","description":"The Futures Neutral Quad Rears are a template that have a balanced feel for all-around performance surfing. From point break racing to beach break smashing, this fin will do it all! Throw these quad rears in for maximum grip and drive! Let's go surfing!\r\n\r\nTemplate Category | Neutral (balanced, all-around)\r\nConstruction | Honeycomb\r\nSize | Small\r\nSold as a pair (left + right fins) to fit Future's shallow depth fin boxes","brand":"Futures","offers":[{"title":"Default Title","offer_id":52178987417883,"sku":"113102","price":90.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/113102.jpg?v=1779154702"},{"product_id":"fcs-ii-performer-pc-medium-quad-rear-tranquil-blue-surfboard-fins","title":"FCS II Performer PC Medium Quad Rear Tranquil Blue Surfboard Fins","description":"\u003carticle\u003e\r\n    \u003ch2\u003eFCS II Performer PC Medium Quad Rear Tranquil Blue Surfboard Fins\u003c\/h2\u003e\r\n    \u003cp\u003eThe \u003cstrong\u003eFCS II Performer PC Medium Quad Rear Fins\u003c\/strong\u003e in Tranquil Blue are crafted for surfers seeking a balanced blend of speed, flow, and responsiveness. These fins are versatile and suitable for a wide variety of wave conditions, making them an essential addition to your setup.\u003c\/p\u003e\r\n\r\n    \u003ch3\u003eKey Features\u003c\/h3\u003e\r\n    \u003cul\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eBalanced Template:\u003c\/strong\u003e Incorporates Inside Foil Technology (IFT) for enhanced drive and maneuverability.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003ePerformance Core (PC) Construction:\u003c\/strong\u003e Lightweight resin transfer molding ensures consistent flex and durability.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eQuad Rear Set:\u003c\/strong\u003e Designed as a two-fin set for use in quad configurations, offering added stability and control.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eFCS II Fin System Compatibility:\u003c\/strong\u003e Tool-less system allows for easy and secure installation or removal.\u003c\/li\u003e\r\n    \u003c\/ul\u003e\r\n\r\n    \u003ch3\u003eDimensions\u003c\/h3\u003e\r\n    \u003cul\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eBase:\u003c\/strong\u003e 4.26 inches (108 mm)\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eDepth:\u003c\/strong\u003e 4.09 inches (104 mm)\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eArea:\u003c\/strong\u003e 12.63 square inches (8150 mm²)\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eSweep:\u003c\/strong\u003e 32.4°\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eFoil:\u003c\/strong\u003e 80\/20\u003c\/li\u003e\r\n    \u003c\/ul\u003e\r\n\r\n    \u003ch3\u003eWhy Choose FCS II Performer PC Medium Quad Rear Fins?\u003c\/h3\u003e\r\n    \u003cp\u003eThese fins are designed to provide excellent all-around performance, making them perfect for surfers who value versatility in their gear. With a balanced template and high-quality construction, the FCS II Performer PC Medium Quad Rear Fins deliver a reliable combination of speed and control, suitable for various board shapes and surfing styles.\u003c\/p\u003e\r\n\r\n    \u003cp\u003eUpgrade your quad fin setup with the FCS II Performer PC Medium Quad Rear Tranquil Blue Surfboard Fins and enjoy enhanced performance across diverse conditions.\u003c\/p\u003e\r\n\u003c\/article\u003e\r\n","brand":"FCS","offers":[{"title":"Default Title","offer_id":52179143262491,"sku":"115406","price":75.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/115406.jpg?v=1779157035"},{"product_id":"fcs-ii-performer-pc-large-quad-rear-tranquil-blue-surfboard-fins","title":"FCS II Performer PC Large Quad Rear Tranquil Blue Surfboard Fins","description":"\u003carticle\u003e\r\n    \u003ch2\u003eFCS II Performer PC Large Quad Rear Tranquil Blue Surfboard Fins\u003c\/h2\u003e\r\n    \u003cp\u003eThe \u003cstrong\u003eFCS II Performer PC Large Quad Rear Fins\u003c\/strong\u003e in Tranquil Blue are designed to provide a balance of speed, flow, and response, making them a reliable choice for surfers seeking all-around performance across various conditions.\u003c\/p\u003e\r\n\r\n    \u003ch3\u003eKey Features\u003c\/h3\u003e\r\n    \u003cul\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eWell-Proportioned Template:\u003c\/strong\u003e Features Inside Foil Technology (IFT) for a balance of drive and maneuverability.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003ePerformance Core (PC) Construction:\u003c\/strong\u003e Multi-layered resin transfer molding process offers a lightweight yet responsive fin.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eQuad Rear Set:\u003c\/strong\u003e Includes two fins designed to be used as rear fins in a quad setup, enhancing stability and control.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eFCS II Fin System Compatibility:\u003c\/strong\u003e Designed to fit the FCS II Fin System for quick and secure installation.\u003c\/li\u003e\r\n    \u003c\/ul\u003e\r\n\r\n    \u003ch3\u003eDimensions\u003c\/h3\u003e\r\n    \u003cul\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eBase:\u003c\/strong\u003e 4.09 inches (104 mm)\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eDepth:\u003c\/strong\u003e 4.25 inches (108 mm)\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eArea:\u003c\/strong\u003e 12.64 square inches (8150 mm²)\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eSweep:\u003c\/strong\u003e 32.4°\u003c\/li\u003e\r\n    \u003c\/ul\u003e\r\n\r\n    \u003ch3\u003eWhy Choose FCS II Performer PC Large Quad Rear Fins?\u003c\/h3\u003e\r\n    \u003cp\u003eThese fins are ideal for surfers who desire a reliable all-around fin that delivers a combination of speed and maneuverability with smooth transitions between turns. The Performance Core construction ensures a consistent feel across a variety of conditions, making them suitable for different board types and surfing styles.\u003c\/p\u003e\r\n\r\n    \u003cp\u003eEnhance your surfing experience with the FCS II Performer PC Large Quad Rear Tranquil Blue Surfboard Fins, and enjoy a balanced performance in diverse wave conditions.\u003c\/p\u003e\r\n\u003c\/article\u003e\r\n","brand":"FCS","offers":[{"title":"Default Title","offer_id":52179143295259,"sku":"115407","price":92.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/115407.jpg?v=1779157037"},{"product_id":"flying-diamonds-tj-4-25-edge-side-bites-futures","title":"Flying Diamonds TJ 4.25\" Edge Side Bites Futures","description":"\u003carticle\u003e\r\n    \u003ch2\u003eFlying Diamonds TJ 4.25\" Edge Side Bites (FCS II Compatible Fin Base): Performance Meets Stability\u003c\/h2\u003e\r\n    \u003cp\u003e\r\n        The \u003cstrong\u003eFlying Diamonds TJ 4.25\" Edge Side Bites\u003c\/strong\u003e, designed to fit FCS II fin boxes, are a culmination of over 20 years of expertise by longboarding legend Taylor Jensen. \r\n        Engineered to deliver a perfect balance of performance and stability, these side fins excel in every condition and on every board. \r\n        While compatible with FCS II fin boxes, these fins require screws for secure installation, ensuring a reliable fit during your surf sessions.\r\n    \u003c\/p\u003e\r\n    \r\n    \u003cp\u003e\r\n        Whether you're seeking long noserides, vertical off-the-lips, or fast, powerful carves, the Edge side fins provide the speed and versatility to elevate your surfing. \r\n        Designed to adapt to various setups and optimized for surfers of all builds and wave types, these fins set a new standard in longboard side fin design.\r\n    \u003c\/p\u003e\r\n    \r\n    \u003cblockquote\u003e\r\n        \u003cp\u003e\u003cem\u003e“These are the fins I trust to take me where I want to go and can’t live without. Designed to handle any condition, they provide speed, versatility, and performance that longboarders need.”\u003c\/em\u003e – Taylor Jensen\u003c\/p\u003e\r\n    \u003c\/blockquote\u003e\r\n    \r\n    \u003ch3\u003eKey Features:\u003c\/h3\u003e\r\n    \u003cul\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003e4.25\" Template:\u003c\/strong\u003e Perfect size for balanced performance and control.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eVersatile Design:\u003c\/strong\u003e Excels in every condition, from noseriding to vertical maneuvers.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003ePrecision Engineering:\u003c\/strong\u003e Provides speed, stability, and adaptability for all wave types.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eFCS II Compatible Base:\u003c\/strong\u003e Designed to fit into FCS II fin boxes but requires screws for secure installation.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eTrusted by Taylor Jensen:\u003c\/strong\u003e Used and perfected over decades on the World Longboard Tour.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Designed to withstand rigorous surfing conditions.\u003c\/li\u003e\r\n    \u003c\/ul\u003e\r\n    \r\n    \u003cp\u003e\r\n        Upgrade your longboard setup with the \u003cstrong\u003eFlying Diamonds TJ 4.25\" Edge Side Bites\u003c\/strong\u003e, and experience the ultimate in speed, stability, and performance.\r\n    \u003c\/p\u003e\r\n\u003c\/article\u003e\r\n","brand":"Flying Diamonds","offers":[{"title":"Black","offer_id":52179458195739,"sku":"116607|Black","price":65.0,"currency_code":"USD","in_stock":false},{"title":"Red","offer_id":52179458261275,"sku":"116607|Red","price":65.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/116607_RED.jpg?v=1779158938"},{"product_id":"fcs-ii-carver-pc-medium-quad-rear-eucalyptus-surfboard-fins","title":"FCS II Carver PC Medium Quad Rear Eucalyptus Surfboard Fins","description":"\u003carticle\u003e  \r\n  \u003ch2\u003eFCS II Carver PC Medium Quad Rear Eucalyptus Surfboard Fins\u003c\/h2\u003e  \r\n  \u003cp\u003eThe \u003cstrong\u003eFCS II Carver PC Medium Quad Rear Fins\u003c\/strong\u003e are designed for surfers who want maximum drive, control, and precision through powerful turns. Ideal for open-face waves and surfers who like to push hard on the rail, these quad rears provide extra hold and projection without sacrificing speed.\u003c\/p\u003e  \r\n\r\n  \u003cp\u003eCrafted with \u003cstrong\u003ePerformance Core (PC) construction\u003c\/strong\u003e, these fins deliver a reliable flex pattern and lightweight feel, allowing for dynamic responsiveness in all conditions. The eucalyptus colorway adds a sleek finish to your setup while complementing the FCS II tool-less fin system for easy in-and-out adjustments.\u003c\/p\u003e  \r\n\r\n  \u003ch3\u003eKey Features\u003c\/h3\u003e  \r\n  \u003cul\u003e  \r\n    \u003cli\u003e\n\u003cstrong\u003ePerformance Core Construction:\u003c\/strong\u003e Lightweight with consistent flex, delivering speed, drive, and control.\u003c\/li\u003e  \r\n    \u003cli\u003e\n\u003cstrong\u003eCarver Template:\u003c\/strong\u003e Engineered for powerful, drawn-out turns with exceptional hold on open-face waves.\u003c\/li\u003e  \r\n    \u003cli\u003e\n\u003cstrong\u003eQuad Rear Set:\u003c\/strong\u003e Designed to pair with your front fins to create a high-performance quad setup.\u003c\/li\u003e  \r\n    \u003cli\u003e\n\u003cstrong\u003eFCS II System:\u003c\/strong\u003e Quick and tool-less fin changes—no screws or plates required.\u003c\/li\u003e  \r\n    \u003cli\u003e\n\u003cstrong\u003eMedium Size:\u003c\/strong\u003e Versatile fit for a broad range of surfers and conditions.\u003c\/li\u003e  \r\n    \u003cli\u003e\n\u003cstrong\u003eEucalyptus Colorway:\u003c\/strong\u003e Stylish and modern look for your board.\u003c\/li\u003e  \r\n  \u003c\/ul\u003e  \r\n\r\n  \u003ch3\u003eWhy Choose Rider Shack?\u003c\/h3\u003e  \r\n  \u003cp\u003eAt \u003cstrong\u003eRider Shack\u003c\/strong\u003e, we know that fins are just as important as your board when it comes to performance. Since 2006, our family-run surf shop has been helping surfers dial in their setups with the best gear available. The \u003cstrong\u003eFCS II Carver PC Medium Quad Rear Fins\u003c\/strong\u003e are a shop favorite for their ability to generate hold, power, and control while keeping your surfing sharp and stylish.\u003c\/p\u003e  \r\n\r\n  \u003cp\u003eUpgrade your quad setup with the \u003cstrong\u003eFCS II Carver PC Medium Quad Rear Fins\u003c\/strong\u003e—available now at Rider Shack.\u003c\/p\u003e  \r\n\u003c\/article\u003e  \r\n","brand":"FCS","offers":[{"title":"Default Title","offer_id":52179632816411,"sku":"117719","price":92.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/117719.jpg?v=1779160783"},{"product_id":"fcs-ii-jon-pyzel-medium-quad-rear-surfboard-fins","title":"FCS II Jon Pyzel Medium Quad Rear Surfboard Fins","description":"\u003carticle\u003e\r\n    \u003ch2\u003eFCS II Jon Pyzel Medium Quad Rear Surfboard Fins\u003c\/h2\u003e\r\n    \u003cp\u003eThe \u003cstrong\u003eFCS II Jon Pyzel Medium Quad Rear Surfboard Fins\u003c\/strong\u003e are designed in collaboration with \u003cstrong\u003eJon Pyzel\u003c\/strong\u003e, the world-renowned shaper behind some of the best-performing surfboards on the planet. Built to complement the Pyzel signature thruster and quad templates, these rear fins offer a perfect balance of drive, control, and flow—ideal for surfers looking to fine-tune their quad setups for powerful, responsive performance.\u003c\/p\u003e\r\n\r\n    \u003ch3\u003eKey Features\u003c\/h3\u003e\r\n    \u003cul\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eJon Pyzel Signature Design:\u003c\/strong\u003e Crafted in collaboration with Pyzel Surfboards for predictable, high-speed performance.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eQuad Rear Set:\u003c\/strong\u003e Designed to pair with Pyzel or other FCS II front fins to create a balanced quad configuration.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eMedium Size:\u003c\/strong\u003e Ideal for surfers weighing 145–175 lbs or those seeking a responsive, all-around setup.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003ePerformance Template:\u003c\/strong\u003e Slightly raked outline provides hold and stability while allowing smooth, flowing transitions.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003ePerformance Core (PC) Construction:\u003c\/strong\u003e Lightweight, durable material offering a responsive flex pattern for speed and control.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eFCS II Tool-Less System:\u003c\/strong\u003e Quick and easy fin installation and removal with no screws or keys required.\u003c\/li\u003e\r\n    \u003c\/ul\u003e\r\n\r\n    \u003ch3\u003eWhy Choose the FCS II Jon Pyzel Quad Rears?\u003c\/h3\u003e\r\n    \u003cp\u003eThe \u003cstrong\u003eFCS II Pyzel Quad Rear Fins\u003c\/strong\u003e are perfect for surfers who want to enhance their board’s performance in various conditions. Whether chasing clean point breaks or carving punchy beach breaks, these fins deliver smooth drive with a controlled release. Designed to complement Jon Pyzel’s modern high-performance boards, they provide the perfect combination of speed, hold, and maneuverability.\u003c\/p\u003e\r\n\r\n    \u003cp\u003eComplete your setup with the \u003cstrong\u003eFCS II Jon Pyzel Medium Quad Rear Surfboard Fins\u003c\/strong\u003e—a precision-crafted addition to your FCS II system for versatile, high-speed surfing.\u003c\/p\u003e\r\n\u003c\/article\u003e\r\n","brand":"FCS","offers":[{"title":"Default Title","offer_id":52179654148379,"sku":"117954","price":92.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/117954.jpg?v=1779161094"},{"product_id":"fcs-ii-jon-pyzel-large-quad-rear-surfboard-fins","title":"FCS II Jon Pyzel Large Quad Rear Surfboard Fins","description":"\u003carticle\u003e\r\n    \u003ch2\u003eFCS II Jon Pyzel Large Quad Rear Surfboard Fins\u003c\/h2\u003e\r\n    \u003cp\u003eThe \u003cstrong\u003eFCS II Jon Pyzel Large Quad Rear Surfboard Fins\u003c\/strong\u003e were developed in collaboration with world-class shaper \u003cstrong\u003eJon Pyzel\u003c\/strong\u003e, delivering power, control, and drive for surfers who push their performance in solid surf. Designed to pair with Pyzel’s front fin templates or other FCS II front fins, these large quad rears provide stability and hold while maintaining smooth flow and responsiveness through turns. Ideal for heavier surfers or those riding larger boards in fast, powerful conditions.\u003c\/p\u003e\r\n\r\n    \u003ch3\u003eKey Features\u003c\/h3\u003e\r\n    \u003cul\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eJon Pyzel Signature Design:\u003c\/strong\u003e Created with Pyzel Surfboards for speed, drive, and precise control in powerful waves.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eQuad Rear Set:\u003c\/strong\u003e Complements Pyzel or other FCS II front fins to form a balanced, high-performance quad configuration.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eLarge Size:\u003c\/strong\u003e Best suited for surfers weighing 175–210 lbs or those seeking maximum hold and stability.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003ePerformance Template:\u003c\/strong\u003e Features a raked outline for smooth, controlled carves and reliable drive down the line.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003ePerformance Core (PC) Construction:\u003c\/strong\u003e Lightweight composite with a responsive flex that mirrors fiberglass for speed and control.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eFCS II Tool-Less System:\u003c\/strong\u003e Snap fins in and out quickly without screws or keys for seamless setup changes.\u003c\/li\u003e\r\n    \u003c\/ul\u003e\r\n\r\n    \u003ch3\u003eWhy Choose the FCS II Jon Pyzel Quad Rears?\u003c\/h3\u003e\r\n    \u003cp\u003eThe \u003cstrong\u003eFCS II Pyzel Large Quad Rear Fins\u003c\/strong\u003e are built for surfers seeking a powerful, drive-oriented feel underfoot. The PC construction provides fast response and consistent flex, while the large template offers extra control for carving through open faces or driving through heavy sections. Designed with Jon Pyzel’s high-performance board designs in mind, these fins enhance speed, stability, and flow in a range of surf conditions.\u003c\/p\u003e\r\n\r\n    \u003cp\u003eLock into power and precision with the \u003cstrong\u003eFCS II Jon Pyzel Large Quad Rear Surfboard Fins\u003c\/strong\u003e—a high-performance setup built to match the demands of advanced surfers and powerful waves.\u003c\/p\u003e\r\n\u003c\/article\u003e\r\n","brand":"FCS","offers":[{"title":"Default Title","offer_id":52179654181147,"sku":"117955","price":92.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/117955.jpg?v=1779161095"},{"product_id":"roam-futures-side-bite-fin-set","title":"Roam Futures Side Bite Fin Set","description":"","brand":"Roam","offers":[{"title":"Smoke \/ MD","offer_id":52179749044507,"sku":"118470|Smoke|MD","price":57.0,"currency_code":"USD","in_stock":false},{"title":"Black \/ MD","offer_id":52179749077275,"sku":"118470|Black|MD","price":57.0,"currency_code":"USD","in_stock":false},{"title":"Clear \/ MD","offer_id":52179749110043,"sku":"118470|Clear|MD","price":57.0,"currency_code":"USD","in_stock":false},{"title":"Ice Blue \/ MD","offer_id":52179749142811,"sku":"118470|Ice Blue|MD","price":57.0,"currency_code":"USD","in_stock":true},{"title":"Burgundy \/ MD","offer_id":52179749175579,"sku":"118470|Burgundy|MD","price":57.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/118470.jpg?v=1779161741"},{"product_id":"roam-futures-quad-rear-fin-set","title":"Roam Futures Quad Rear Fin Set","description":"","brand":"Roam","offers":[{"title":"Smoke \/ MD","offer_id":52179749208347,"sku":"118471|Smoke|MD","price":67.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ MD","offer_id":52179749241115,"sku":"118471|Black|MD","price":67.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/118471_SMOKE.jpg?v=1779161745"},{"product_id":"flying-diamonds-npj-rear-quad-or-side-bites-fcs-ii","title":"Flying Diamonds NPJ Rear Quad or Side Bites FCS II","description":"","brand":"Flying Diamonds","offers":[{"title":"Amber","offer_id":52179759202587,"sku":"118612|Amber","price":65.0,"currency_code":"USD","in_stock":true},{"title":"White","offer_id":52179759235355,"sku":"118612|White","price":65.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/118612_AMBER.jpg?v=1779161867"},{"product_id":"fcs-ii-channel-islands-solution-quad-rear-fins-lg","title":"FCS II Channel Islands Solution Quad Rear Fins LG","description":"\u003cdiv class=\"product-description\"\u003e\r\n  \u003ch2\u003eFCS II Channel Islands Solution Quad Rear Fin Set - Large\u003c\/h2\u003e\r\n\r\n  \u003cp\u003eThe FCS II Channel Islands Solution Quad Rear Fin Set in Large is a fast, controlled, and highly responsive rear fin set designed by Britt Merrick and developed in collaboration with Channel Islands Surfboards. Based on the popular CI Upright template, this rear set is built to pair seamlessly with the upright CI side fins and create a performance quad setup focused on speed, hold, and tight, pivot-driven turns.\u003c\/p\u003e\r\n\r\n  \u003cp\u003eFeaturing a neutral-raked template and refined 80\/20 foil, the Solution Quad Rears offer a balanced feel underfoot with the stability needed to hold clean lines through critical sections while still allowing for quick release and fast direction changes. This combination makes them an excellent choice for surfers who want a quad setup that feels lively and performance-minded without losing control. When paired with CI Solution side fins, they help enhance overall drive and hold while maintaining the loose, responsive release that makes a good quad setup so fun to ride.\u003c\/p\u003e\r\n\r\n  \u003cp\u003eBuilt in Performance Core construction, these fins are lightweight with a progressive flex pattern that supports speed, control, and versatility across a wide range of surf conditions. While they excel in punchy, hollow waves where responsiveness matters most, they also work beautifully in open-face waves and down-the-line point break surf where speed and directional control come alive.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhy You'll Love It\u003c\/h3\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003eDesigned by Britt Merrick in collaboration with Channel Islands Surfboards\u003c\/li\u003e\r\n    \u003cli\u003eBased on the proven CI Upright design\u003c\/li\u003e\r\n    \u003cli\u003eNeutral rake offers a strong balance of control and pivot\u003c\/li\u003e\r\n    \u003cli\u003e80\/20 foil improves stability and directional control\u003c\/li\u003e\r\n    \u003cli\u003eBuilt to pair with CI Solution side fins for a high-performance quad setup\u003c\/li\u003e\r\n    \u003cli\u003ePerformance Core construction delivers lightweight feel and responsive flex\u003c\/li\u003e\r\n    \u003cli\u003eExcellent for speed, tight turns, and clean release\u003c\/li\u003e\r\n    \u003cli\u003eIdeal for punchy, hollow waves and high-performance surfing\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003ch3\u003ePerformance Feel\u003c\/h3\u003e\r\n  \u003cp\u003eThe Channel Islands Solution Quad Rears feel fast, controlled, and highly responsive. The upright-inspired template supports quick transitions and tight, pivot-style turns, while the 80\/20 foil helps keep the board stable and predictable through critical maneuvers. When paired with CI Solution side fins, this rear set adds drive and hold without sacrificing release.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eIdeal Conditions\u003c\/h3\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003eOpen-face waves\u003c\/li\u003e\r\n    \u003cli\u003eDown-the-line point breaks\u003c\/li\u003e\r\n    \u003cli\u003eLong, carving turns on clean walls\u003c\/li\u003e\r\n    \u003cli\u003ePunchy, hollow surf where speed and responsiveness matter\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003ch3\u003eFeatures\u003c\/h3\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003eModel: FCS II Channel Islands Solution Quad Rear Set\u003c\/li\u003e\r\n    \u003cli\u003eSize: Large\u003c\/li\u003e\r\n    \u003cli\u003eTemplate Family: Carver\u003c\/li\u003e\r\n    \u003cli\u003eConstruction: Performance Core\u003c\/li\u003e\r\n    \u003cli\u003eFin System: FCS II\u003c\/li\u003e\r\n    \u003cli\u003eTemplate Feel: Speed, control, and tight directional surfing\u003c\/li\u003e\r\n    \u003cli\u003eFoil: 80\/20\u003c\/li\u003e\r\n    \u003cli\u003eRecommended For: CI Performance Boards, especially the CI Solution\u003c\/li\u003e\r\n    \u003cli\u003eDesigned To Pair With: CI Solution Side Fins\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003cp\u003eWhen you shop at Rider Shack, you’re supporting a small business and core surf shop run by surfers who care about quality gear, real surf knowledge, and genuine customer service.\u003c\/p\u003e\r\n\u003c\/div\u003e","brand":"FCS","offers":[{"title":"Default Title","offer_id":52197525913883,"sku":"118764","price":92.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/118764.jpg?v=1779162029"},{"product_id":"fcs-ii-channel-islands-solution-quad-rear-fins-md","title":"FCS II Channel Islands Solution Quad Rear Fins MD","description":"\u003cdiv class=\"product-description\"\u003e\r\n  \u003ch2\u003eFCS II Channel Islands Solution Quad Rear Fin Set - Medium\u003c\/h2\u003e\r\n\r\n  \u003cp\u003eThe FCS II Channel Islands Solution Quad Rear Fin Set in Medium is a fast, controlled, and highly responsive rear fin set designed by Britt Merrick and developed in collaboration with Channel Islands Surfboards. Based on the popular CI Upright template, this rear set is built to pair seamlessly with the upright CI side fins and create a performance quad setup focused on speed, hold, and tight, pivot-driven turns.\u003c\/p\u003e\r\n\r\n  \u003cp\u003eFeaturing a neutral-raked template and refined 80\/20 foil, the Solution Quad Rears offer a balanced feel underfoot with the stability needed to hold clean lines through critical sections while still allowing for quick release and fast direction changes. This combination makes them an excellent choice for surfers who want a quad setup that feels lively and performance-minded without losing control. When paired with CI Solution side fins, they help enhance overall drive and hold while maintaining the loose, responsive release that makes a good quad setup so fun to ride.\u003c\/p\u003e\r\n\r\n  \u003cp\u003eBuilt in Performance Core construction, these fins are lightweight with a progressive flex pattern that supports speed, control, and versatility across a wide range of surf conditions. While they excel in punchy, hollow waves where responsiveness matters most, they also work beautifully in open-face waves and down-the-line point break surf where speed and directional control come alive.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhy You'll Love It\u003c\/h3\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003eDesigned by Britt Merrick in collaboration with Channel Islands Surfboards\u003c\/li\u003e\r\n    \u003cli\u003eBased on the proven CI Upright design\u003c\/li\u003e\r\n    \u003cli\u003eNeutral rake offers a strong balance of control and pivot\u003c\/li\u003e\r\n    \u003cli\u003e80\/20 foil improves stability and directional control\u003c\/li\u003e\r\n    \u003cli\u003eBuilt to pair with CI Solution side fins for a high-performance quad setup\u003c\/li\u003e\r\n    \u003cli\u003ePerformance Core construction delivers lightweight feel and responsive flex\u003c\/li\u003e\r\n    \u003cli\u003eExcellent for speed, tight turns, and clean release\u003c\/li\u003e\r\n    \u003cli\u003eIdeal for punchy, hollow waves and high-performance surfing\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003ch3\u003ePerformance Feel\u003c\/h3\u003e\r\n  \u003cp\u003eThe Channel Islands Solution Quad Rears feel fast, controlled, and highly responsive. The upright-inspired template supports quick transitions and tight, pivot-style turns, while the 80\/20 foil helps keep the board stable and predictable through critical maneuvers. When paired with CI Solution side fins, this rear set adds drive and hold without sacrificing release.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eIdeal Conditions\u003c\/h3\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003eOpen-face waves\u003c\/li\u003e\r\n    \u003cli\u003eDown-the-line point breaks\u003c\/li\u003e\r\n    \u003cli\u003eLong, carving turns on clean walls\u003c\/li\u003e\r\n    \u003cli\u003ePunchy, hollow surf where speed and responsiveness matter\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003ch3\u003eFeatures\u003c\/h3\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003eModel: FCS II Channel Islands Solution Quad Rear Set\u003c\/li\u003e\r\n    \u003cli\u003eSize: Medium\u003c\/li\u003e\r\n    \u003cli\u003eTemplate Family: Carver\u003c\/li\u003e\r\n    \u003cli\u003eConstruction: Performance Core\u003c\/li\u003e\r\n    \u003cli\u003eFin System: FCS II\u003c\/li\u003e\r\n    \u003cli\u003eTemplate Feel: Speed, control, and tight directional surfing\u003c\/li\u003e\r\n    \u003cli\u003eFoil: 80\/20\u003c\/li\u003e\r\n    \u003cli\u003eRecommended For: CI Performance Boards, especially the CI Solution\u003c\/li\u003e\r\n    \u003cli\u003eDesigned To Pair With: CI Solution Side Fins\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003cp\u003eWhen you shop at Rider Shack, you’re supporting a small business and core surf shop run by surfers who care about quality gear, real surf knowledge, and genuine customer service.\u003c\/p\u003e\r\n\u003c\/div\u003e","brand":"FCS","offers":[{"title":"Default Title","offer_id":52197526044955,"sku":"118765","price":92.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/118765.jpg?v=1779162030"}],"url":"https:\/\/ridershack.com\/collections\/side-quad-rear-fins.oembed","provider":"Rider Shack","version":"1.0","type":"link"}